Issue #3205269: After resetting an override to default, override form still loads the previous override

src/Form/DashboardLayoutBuilderForm.php

@@ -133,6 +133,10 @@ class DashboardLayoutBuilderForm extends EntityForm {
       $this->account->id(),
       $this->sectionStorage->getContextValue(Dashboard::CONTEXT_TYPE)->id()
     );
+
+    // Delete the tempstore so the override form is reloaded as well.
+    $this->layoutTempstoreRepository->delete($this->sectionStorage);
+
     $form_state->setRedirectUrl(
       Url::fromRoute('entity.dashboard.canonical', [
         'dashboard' => $this->sectionStorage->getContextValue(Dashboard::CONTEXT_TYPE)->id(),